fix: Unnest workspaces command to the top-level (#1241)

This changes all "coder workspace *" commands to root.
A few of these were already at the root, like SSH. The
inconsistency made for a confusing experience.

cli/tunnel.go

@@ -2,7 +2,7 @@ package cli
 
 import "github.com/spf13/cobra"
 
-func workspaceTunnel() *cobra.Command {
+func tunnel() *cobra.Command {
 	return &cobra.Command{
 		Use: "tunnel",
 		RunE: func(cmd *cobra.Command, args []string) error {